@font-face {
  font-family: "Atkinson Hyperlegible Next";
  src: url("/fonts/atkinson-hyperlegible-next-latin.woff2") format("woff2");
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --font: "Atkinson Hyperlegible Next", ui-sans-serif, system-ui, -apple-system, "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;

  --paper: oklch(97.8% 0.007 85);
  --paper-raised: oklch(94.4% 0.011 80);
  --ink: oklch(28.5% 0.008 70);
  --ink-soft: oklch(45% 0.013 70);
  --rule: oklch(87% 0.013 78);
  --accent: oklch(49.9% 0.107 52);
  --on-accent: oklch(97.8% 0.007 85);

  --reader: oklch(25.6% 0.007 70);
  --reader-ink: oklch(93.9% 0.005 80);
  --reader-soft: oklch(79% 0.011 78);
  --reader-dim: oklch(60% 0.012 75);
  --reader-rule: oklch(35% 0.009 70);
  --reader-accent: oklch(77.5% 0.112 64);
  --on-reader-accent: oklch(22% 0.008 64);
  --terminal: oklch(21.5% 0.006 70);
  --terminal-ink: oklch(80% 0.01 80);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;
  --gutter: clamp(1rem, 0.4rem + 3vw, 3rem);
  --measure: 70rem;

  --text-xs: 0.8125rem;
  --text-sm: 0.9375rem;
  --text-base: 1.0625rem;
  --text-lg: 1.375rem;
  --text-xl: clamp(1.75rem, 1.3rem + 1.6vw, 2.5rem);
  --text-2xl: clamp(2.5rem, 1.6rem + 3.4vw, 4.5rem);
  --text-word: clamp(3.5rem, 1.2rem + 10vw, 9.5rem);

  --ease-out: cubic-bezier(0.25, 1, 0.5, 1);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: oklch(19.5% 0.006 70);
    --paper-raised: oklch(23.5% 0.008 70);
    --ink: oklch(92.5% 0.005 80);
    --ink-soft: oklch(75% 0.011 78);
    --rule: oklch(31% 0.009 70);
    --accent: oklch(77.5% 0.112 64);
    --on-accent: oklch(22% 0.008 64);
    --terminal: oklch(16.5% 0.005 70);
    color-scheme: dark;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--text-base);
  line-height: 1.55;
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
p,
ol,
ul,
dl,
dd,
figure {
  margin: 0;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

p,
li,
dd {
  text-wrap: pretty;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip {
  position: absolute;
  left: var(--gutter);
  top: -4rem;
  z-index: 10;
  padding: var(--space-2) var(--space-4);
  background: var(--reader-accent);
  color: var(--on-reader-accent);
  border-radius: 6px;
  text-decoration: none;
}

.skip:focus {
  top: var(--space-4);
}

kbd {
  display: inline-block;
  min-width: 1.75em;
  padding: 0.1em 0.45em 0.05em;
  border: 1px solid var(--rule);
  border-bottom-width: 2px;
  border-radius: 0.4em;
  background: var(--paper-raised);
  font-family: inherit;
  font-size: 0.82em;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  vertical-align: 0.08em;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.85rem 1.4rem 0.85rem 1.15rem;
  border-radius: 0.65rem;
  background: var(--reader-accent);
  color: var(--on-reader-accent);
  font-weight: 650;
  font-size: var(--text-base);
  line-height: 1.2;
  text-decoration: none;
  transition: transform 150ms var(--ease-out), background-color 150ms var(--ease-out);
}

.button svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button:hover {
  background: oklch(82% 0.11 66);
}

.button:active {
  transform: translateY(1px);
}

.button-paper {
  background: var(--accent);
  color: var(--on-accent);
}

.button-paper:hover {
  background: oklch(from var(--accent) calc(l - 0.04) c h);
}

/* Hero: the reader at page scale */

.hero {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: min(100svh, 60rem);
  padding: max(var(--space-4), env(safe-area-inset-top)) var(--gutter) var(--space-7);
  background: var(--reader);
  color: var(--reader-ink);
  line-height: 1.6;
  letter-spacing: 0.01em;
}

.hero :focus-visible {
  outline-color: var(--reader-accent);
}

.bar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  width: 100%;
  max-width: var(--measure);
  margin-inline: auto;
}

.wordmark {
  font-size: var(--text-lg);
  font-weight: 650;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.wordmark span {
  color: var(--reader-accent);
}

.bar-link {
  padding: var(--space-2) 0;
  color: var(--reader-soft);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color 150ms var(--ease-out);
}

.bar-link:hover {
  color: var(--reader-ink);
}

.stage {
  display: grid;
  align-content: center;
  justify-items: center;
  gap: var(--space-5);
  padding-block: var(--space-8) var(--space-7);
}

.reader-line {
  position: relative;
  display: grid;
  align-items: center;
  width: 100%;
  max-width: var(--measure);
  height: calc(var(--text-word) * 1.5);
}

.reader-line::before,
.reader-line::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 2px;
  height: calc(var(--text-word) * 0.16);
  background: var(--reader-dim);
  transform: translateX(-50%);
}

.reader-line::before {
  top: 0;
}

.reader-line::after {
  bottom: 0;
}

.word {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: baseline;
  font-size: calc(var(--text-word) * var(--fit, 1));
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0;
  white-space: pre;
}

.word .pre {
  text-align: right;
}

.word .focal {
  color: var(--reader-accent);
  font-weight: 600;
}

.word .post {
  text-align: left;
}

.reader-line.is-rested .word {
  opacity: 0.35;
  transition: opacity 600ms var(--ease-out);
}

.transport {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  opacity: 0.55;
  transition: opacity 200ms var(--ease-out);
}

.transport[hidden] {
  display: none;
}

.stage:hover .transport,
.stage:focus-within .transport,
.stage.is-done .transport {
  opacity: 1;
}

@media (hover: none) {
  .transport {
    opacity: 1;
  }
}

.control {
  display: inline-grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--reader-rule);
  border-radius: 50%;
  background: transparent;
  color: var(--reader-soft);
  cursor: pointer;
  transition: color 150ms var(--ease-out), border-color 150ms var(--ease-out), background-color 150ms var(--ease-out);
}

.control:hover {
  color: var(--reader-ink);
  border-color: var(--reader-dim);
}

.control svg {
  width: 1.1rem;
  height: 1.1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.control-main {
  width: 3.25rem;
  height: 3.25rem;
  color: var(--reader-ink);
  border-color: var(--reader-dim);
}

.control-main .icon-play {
  fill: currentColor;
  stroke: none;
  transform: translateX(1px);
}

.control-main .icon-pause,
.control-main .icon-replay,
.stage.is-playing .control-main .icon-play,
.stage.is-done .control-main .icon-play {
  display: none;
}

.stage.is-playing .control-main .icon-pause,
.stage.is-done .control-main .icon-replay {
  display: block;
}

.control-tick[aria-pressed="true"] {
  color: var(--on-reader-accent);
  background: var(--reader-accent);
  border-color: var(--reader-accent);
}

.pace {
  min-width: 5.5rem;
  color: var(--reader-soft);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.hero-foot {
  display: grid;
  gap: var(--space-5);
  width: 100%;
  max-width: var(--measure);
  margin-inline: auto;
}

.hero h1 {
  font-size: var(--text-2xl);
  font-weight: 650;
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.lede {
  max-width: 34rem;
  color: var(--reader-soft);
  font-size: var(--text-lg);
  line-height: 1.5;
}

.cta {
  display: grid;
  justify-items: start;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.cta-meta,
.cta-pending {
  color: var(--reader-dim);
  font-size: var(--text-sm);
}

.cta-pending {
  color: var(--reader-soft);
}

@media (min-width: 60rem) {
  .hero-foot {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
    gap: var(--space-8);
  }
}

/* Paper sections */

main {
  padding-inline: var(--gutter);
}

main > section {
  max-width: var(--measure);
  margin-inline: auto;
}

main h2 {
  font-size: var(--text-xl);
  font-weight: 650;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.steps {
  padding-block: var(--space-10) var(--space-8);
}

.steps ol {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: var(--space-7) var(--space-6);
  margin-top: var(--space-7);
  padding: 0;
  list-style: none;
}

.steps li {
  display: grid;
  align-content: start;
  gap: var(--space-3);
  padding-top: var(--space-5);
  border-top: 1px solid var(--rule);
}

.step-number {
  color: var(--accent);
  font-size: 3.25rem;
  font-weight: 250;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.steps h3 {
  margin-top: var(--space-2);
  font-size: var(--text-lg);
  font-weight: 650;
  line-height: 1.3;
}

.steps p {
  max-width: 34ch;
  color: var(--ink-soft);
}

.walls {
  display: grid;
  gap: var(--space-7);
  padding-block: var(--space-8) var(--space-9);
}

.walls-copy > p {
  max-width: 38ch;
  margin-top: var(--space-4);
  color: var(--ink-soft);
  font-size: var(--text-lg);
  line-height: 1.5;
}

.facts {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
  padding: 0;
  list-style: none;
}

.facts li {
  max-width: 44ch;
  color: var(--ink-soft);
}

.facts strong {
  display: block;
  color: var(--ink);
  font-weight: 650;
}

@media (min-width: 64rem) {
  .walls {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
    gap: var(--space-8);
  }
}

/* Illustration: two terminal panes with one captured paragraph */

.scene {
  container-type: inline-size;
}

.scene-window {
  position: relative;
  overflow: hidden;
  border: 1px solid oklch(32% 0.008 70);
  border-radius: 12px;
  background: var(--terminal);
  color: var(--terminal-ink);
  font-family: var(--mono);
  font-size: clamp(0.5625rem, 1.85cqi, 0.8125rem);
  line-height: 1.6;
  box-shadow: 0 1px 0 oklch(100% 0 0 / 0.04) inset, 0 24px 48px -28px oklch(20% 0.02 60 / 0.55);
}

.scene-chrome {
  display: flex;
  gap: 0.5em;
  padding: 0.9em 1.1em;
  border-bottom: 1px solid oklch(30% 0.008 70);
}

.scene-chrome i {
  width: 0.8em;
  height: 0.8em;
  border-radius: 50%;
  background: oklch(38% 0.008 70);
}

.scene-panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 30em;
}

.pane {
  display: grid;
  align-content: start;
  gap: 1em;
  padding: 1.2em 1.4em 2em;
}

.pane + .pane {
  border-left: 1px solid oklch(30% 0.008 70);
}

.prompt {
  color: oklch(70% 0.06 150);
}

.caret {
  display: inline-block;
  width: 0.6em;
  height: 1.1em;
  vertical-align: -0.2em;
  background: var(--terminal-ink);
}

.hit {
  margin: -0.45em -0.6em;
  padding: 0.45em 0.6em;
  border-radius: 0.4em;
  color: oklch(92% 0.008 80);
  box-shadow: 0 0 0 2px var(--reader-accent);
}

.scene-reader {
  position: absolute;
  right: 3.5%;
  bottom: 5%;
  width: 44%;
  aspect-ratio: 480 / 112;
  display: grid;
  align-items: center;
  border: 1px solid oklch(40% 0.01 70 / 0.7);
  border-radius: 14px;
  background: oklch(27% 0.008 70 / 0.88);
  color: var(--reader-ink);
  font-family: var(--font);
  box-shadow: 0 18px 40px -16px oklch(10% 0.01 60 / 0.7);
}

.scene-reader .word {
  font-size: 4.6cqi;
  padding-inline: 0.4em;
}

.scene-pointer {
  position: absolute;
  left: 72%;
  top: 47%;
  width: 4.2cqi;
  min-width: 14px;
  fill: oklch(98% 0.003 80);
  stroke: oklch(18% 0.005 70);
  stroke-width: 1.3;
  stroke-linejoin: round;
}

@container (max-width: 34rem) {
  .scene-panes {
    grid-template-columns: 1fr;
    min-height: 24em;
  }

  .pane:first-child {
    display: none;
  }

  .pane + .pane {
    border-left: 0;
  }

  .scene-window {
    font-size: 3cqi;
  }

  .scene-reader {
    width: 74%;
  }

  .scene-reader .word {
    font-size: 7.6cqi;
  }

  .scene-pointer {
    left: 52%;
    top: 47%;
    width: 6cqi;
  }
}

.keys {
  padding-block: var(--space-8);
  border-top: 1px solid var(--rule);
}

.keys dl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 26rem), 1fr));
  column-gap: var(--space-8);
  margin-top: var(--space-6);
}

.keys dl > div {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  align-items: baseline;
  gap: var(--space-4);
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--rule);
}

.keys dt {
  white-space: nowrap;
}

.keys dd {
  color: var(--ink-soft);
}

.privacy {
  display: grid;
  gap: var(--space-5);
  padding-block: var(--space-9);
}

.privacy h2 {
  font-size: var(--text-2xl);
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.privacy-copy {
  display: grid;
  gap: var(--space-4);
  max-width: 36rem;
  color: var(--ink-soft);
  font-size: var(--text-lg);
  line-height: 1.5;
}

.privacy-copy p:first-child {
  color: var(--ink);
}

@media (min-width: 60rem) {
  .privacy {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-8);
  }
}

.download {
  display: grid;
  justify-items: start;
  gap: var(--space-5);
  padding-block: var(--space-8) var(--space-9);
  border-top: 1px solid var(--rule);
}

.download-action {
  display: grid;
  justify-items: start;
  gap: var(--space-3);
}

.download-meta {
  color: var(--ink-soft);
  font-size: var(--text-sm);
}

.notice {
  max-width: 44rem;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--accent);
  border-radius: 0.6rem;
  background: var(--paper-raised);
}

.first-run {
  display: grid;
  gap: var(--space-2);
  max-width: 44rem;
  padding-left: 1.25em;
  color: var(--ink-soft);
}

.first-run li::marker {
  color: var(--accent);
  font-weight: 650;
}

.checksum {
  max-width: 100%;
  color: var(--ink-soft);
  font-size: var(--text-xs);
}

.checksum summary {
  cursor: pointer;
}

.checksum code {
  display: block;
  margin-top: var(--space-2);
  font-family: var(--mono);
  overflow-wrap: anywhere;
}

.download-pending {
  max-width: 40rem;
  color: var(--ink-soft);
  font-size: var(--text-lg);
  line-height: 1.5;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2) var(--space-6);
  margin-inline: max(var(--gutter), calc((100% - var(--measure)) / 2));
  padding: var(--space-6) 0 max(var(--space-7), env(safe-area-inset-bottom));
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
  font-size: var(--text-sm);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}